The 1986 Dodge Ram Wagon tire size depends on trim: the B150, 3.7 H, Automatic takes P205/75R15; the B150, 3.7 H, Standard takes P205/75R15; the B150, 5.2 T, Automatic, A727 takes P205/75R15; the B150, 5.2 T, Automatic, A999 takes P205/75R15; the B150, 5.2 T, Standard takes P205/75R15; the B250, Van Passenger Extended, 5.2 T takes P235/75R15 XL; the B250, Van Passenger Extended, 5.9 W takes P235/75R15 XL; the B250, Van Passenger, 3.7 H, Automatic takes P225/75R15; the B250, Van Passenger, 3.7 H, Standard takes P225/75R15; the B250, Van Passenger, 5.2 T, Automatic, A727 takes P225/75R15; the B250, Van Passenger, 5.2 T, Automatic, A999 takes P225/75R15; the B250, Van Passenger, 5.2 T, Standard takes P225/75R15; the B250, Van Passenger, 5.9 W takes P225/75R15, per the factory service manual.
Factory-Spec Tire Size
Varies by trim
B150, 3.7 H, Automatic: P205/75R15
B150, 3.7 H, Standard: P205/75R15
B150, 5.2 T, Automatic, A727: P205/75R15
B150, 5.2 T, Automatic, A999: P205/75R15
B150, 5.2 T, Standard: P205/75R15
B250, Van Passenger Extended, 5.2 T: P235/75R15 XL
B250, Van Passenger Extended, 5.9 W: P235/75R15 XL
B250, Van Passenger, 3.7 H, Automatic: P225/75R15
B250, Van Passenger, 3.7 H, Standard: P225/75R15
B250, Van Passenger, 5.2 T, Automatic, A727: P225/75R15
B250, Van Passenger, 5.2 T, Automatic, A999: P225/75R15